原子探针层析成像定点样品的充氢和充氘
Hydrogen and deuterium charging of site-specific specimen for atom probe tomography
摘要：
氢脆会导致高强度金属材料的机械性能急剧恶化。尽管进行了数十年的实验和建模研究，但氢脆背后的确切机制仍然难以捉摸。为了解开机制的理解，从而帮助减轻氢和相关脆化的影响，有必要研究氢与晶界，位错和堆垛层错等结构缺陷的相互作用。原子探针层析成像（APT）原则上可以分析特定位于这种微观结构特征处的氢，但在用氢或氘对样品进行充电时面临着巨大的挑战。在这里，我们描述了三种不同的工作流程，使氢/氘充电的网站特定的APT标本：即阴极，等离子体和气体充电。我们详细讨论了不同方法的注意事项，以帮助未来的研究工作，并促进金属中氢的进一步研究。我们的研究表明，成功的阴极和气体充电，后者更有希望的分析高强度钢在我们的工作的核心。
英文摘要：
Hydrogen embrittlement can cause a dramatic deterioration of the mechanical properties of high-strength metallic materials. Despite decades of experimental and modelling studies, the exact underlying mechanisms behind hydrogen embrittlement remain elusive. To unlock understanding of the mechanism and thereby help mitigate the influence of hydrogen and the associated embrittlement, it is essential to examine the interactions of hydrogen with structural defects such as grain boundaries, dislocations and stacking faults. Atom probe tomography (APT) can, in principle, analyse hydrogen located specifically at such microstructural features but faces strong challenges when it comes to charging specimens with hydrogen or deuterium. Here, we describe three different workflows enabling hydrogen/deuterium charging of site-specific APT specimens: namely cathodic, plasma and gas charging. We discuss in detail the caveats of the different approaches in order to help with future research efforts and facilitate further studies of hydrogen in metals. Our study demonstrates successful cathodic and gas charging, with the latter being more promising for the analysis of the high-strength steels at the core of our work.
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